Water cooler



FIG. 1 is a front perspective view of a water cooler showing the new design;

FIG. 2 is a front elevation view thereof, the rear elevation view not shown as it contains no claimed ornamental features;

FIG. 3 is a right-side elevation view thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is bottom plan view thereof.

The broken lines shown in the drawings depict portions of the water cooler that form no part of the claimed design. 

CLAIM The ornamental design for a water cooler, as shown and described above. 